Swivel base



Jan. 10, 1950 w. y. cRlTcHFxELD v 2,494,230

SWIVEL BASE Filed May 5, 1947 Patented Jan. 10, 1950 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a swivel base, and more particularly to a swivel base for tools or the like.

A primary object of the invention is the provision of an improved swivel base for tools characterized by means whereby the tool, such as a vice, a machine tool, or the like may be readily released for rotation, and subsequently locked in rotated position.

An additional object of the invention is the provision of such a device wherein the operation of locking and rotating the tool may be accomplished with a minimum of difficulty, time and effort.

A further object of the invention is the provision of such a device which is sturdy and durable in construction, reliable and efficient in operation, and relatively simple and inexpensive to manufacture and assemble.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawing Figure 1 is a fragmentary front elevational View of the base of the instant invention showing a tool associated therewith.

Figure 2 is a sectional View taken substantially along the line 2-2 of Figure 1 in view of the direction indicated by the arrows.

Figure 3 is a sectional view taken substantially along the line 3-3 of Figure 2 in View of the direction indicated by the arrows.

Similar reference characters refer to similar parts throughout the several views of the drawing.

Referring now to the drawing, the device of the instant invention includes a tool Ill of any desired conventional type, such for example, a vice or the like, provided in its lower base with a recess, the rear portion of which is semi-circular, as indicated at I l, see Figure 2, and chamfered as indicated at I2, see Figure 3.

The sides of the recess opposite to the semicircular portion l I are parallel as indicated at I3, and extend outwardly to the edge of the tool. A base member IlI is provided, and includes a projecting portion l5, oppositely chamfered as at I6, and of circular configuration, upon which the tool is adapted to be fitted.

Obviously, parts will be held, by the chamfered edges, against vertical displacement, and due to the relative circular configuration of the parts may freely rotate with respect to each other.

A slide member I1, having a semi-circular internal chamfered face, adapted to coact with the base portion I5 to form a circular chamfered locking member engageable with the aperture in the base of the tool, precluding through the oppositely chamfered faces rotation of the tool.

Plate II is adapted to be held in locked position against the tool IU as by means of screws 20, engageable in suitable threaded apertures therein.

It is to be noted that the parallel sides I3 are also chamfered to receive the corresponding oppositely ohamfered parallel sides of the slide I1.

From the foregoing, the operation of the device should be readily understandable and further explanation is deemed unnecessary.

As many embodiments may be made of this inventive concept, and as many modiiications may be made in the embodiment herein shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

What is claimed is:

In a device of the character described, the combination of a tool having a chamfered recess in the lower surface of the base thereof, said recess having parallel sides extending to one edge thereof, the inner ends of the parallel sides of the recess terminating in a semi-circular portion, a supporting base having a circular chamfered boss rising therefrom, and fitting in the chamfered recesses of the tool base, a slide member having a chamfered semi-circular end portion co-acting with said boss rising from the stationary base and slidable between said parallel sides of said recesses of the tool base, an upstanding ange formed along the front edge of the slide member engaging the base, said flange having openings registering with openings in the tool base, and bolts extending through the registering openings securing the slide against movement and in frictional contact with the chamfered boss of the stationary base.

WALTER VIRGIL CRITCHFIELD.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 315,464 Blessing Apr. 14, 1885 331,905 Northall Dec. 8, 1885 691,477 Murphy Jan. 21, 1902 

